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Blagovetshenskiy I.V., Shumilkin I.A. (2006) Gastropod Mollusks from the Hauterivian of Ulyanovsk (Volga region): 1. Family Aporrhaidae // Paleontological Journal. 2006. Vol. 40. N. 1. P. 34-45.

Data on the detailed stratigraphic range of eight species of gastropod mollusks from the Upper Hauterivian of Ulyanovsk (Volga Region) are presented. A new genus, Trilemma, is established within the family Aporrhaidae. Two new species of this genus, T. russiense sp. nov. and T. striatocarinatum (Sinzow, 1880), are described.